<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        span {
            border: 1px solid black;
            display: block;
            width: 500px;
            height: 100px;
        }

        div {
            border: red solid 10px;

            border-width: 10px;
            border-top-width: 2px;
            border-bottom-width: 5px;
            border-left-width: 8px;
            border-right-width: 3px;

            border-style: solid;
            border-top-style: solid;
            border-bottom-style: dotted;
            border-left-style: double;
            border-right-style: dashed;

            border-color: red;
            border-color: red blue;
            border-color: red blue;
            border-color: red blue yellow;
            border-color: red blue yellow purple;
            width: 500px;
            height: 70px;

            padding: 10px 50px;

            /* margin: 0 auto; */
            margin: 50px;
            /* margin-top: 50px;
            margin-bottom: 30px; */
        }

        body {
            padding: 100px;
        }
    </style>

</head>

<body>
    <div class="front32">我是一个div，class为front32</div>
    <div class="front32">我是一个div，class为front32</div>
    <div><a href="#">我是一个div</a></div>

    <span>span1</span>
</body>

</html>